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|
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.fcron;
queuelen = if cfg.queuelen == null then "" else "-q ${toString cfg.queuelen}";
# Duplicate code, also found in cron.nix. Needs deduplication.
systemCronJobs =
''
SHELL=${pkgs.bash}/bin/bash
PATH=${config.system.path}/bin:${config.system.path}/sbin
${optionalString (config.services.cron.mailto != null) ''
MAILTO="${config.services.cron.mailto}"
''}
NIX_CONF_DIR=/etc/nix
${lib.concatStrings (map (job: job + "\n") config.services.cron.systemCronJobs)}
'';
allowdeny = target: users:
{ source = pkgs.writeText "fcron.${target}" (concatStringsSep "\n" users);
target = "fcron.${target}";
mode = "644";
gid = config.ids.gids.fcron;
};
in
{
###### interface
options = {
services.fcron = {
enable = mkOption {
type = types.bool;
default = false;
description = "Whether to enable the <command>fcron</command> daemon.";
};
allow = mkOption {
type = types.listOf types.str;
default = [ "all" ];
description = ''
Users allowed to use fcrontab and fcrondyn (one name per
line, <literal>all</literal> for everyone).
'';
};
deny = mkOption {
type = types.listOf types.str;
default = [];
description = "Users forbidden from using fcron.";
};
maxSerialJobs = mkOption {
type = types.int;
default = 1;
description = "Maximum number of serial jobs which can run simultaneously.";
};
queuelen = mkOption {
type = types.nullOr types.int;
default = null;
description = "Number of jobs the serial queue and the lavg queue can contain.";
};
systab = mkOption {
type = types.lines;
default = "";
description = ''The "system" crontab contents.'';
};
};
};
###### implementation
config = mkIf cfg.enable {
services.fcron.systab = systemCronJobs;
environment.etc = listToAttrs
(map (x: { name = x.target; value = x; })
[ (allowdeny "allow" (cfg.allow))
(allowdeny "deny" cfg.deny)
# see man 5 fcron.conf
{ source =
let
isSendmailWrapped =
lib.hasAttr "sendmail" config.security.wrappers;
sendmailPath =
if isSendmailWrapped then "/run/wrappers/bin/sendmail"
else "${config.system.path}/bin/sendmail";
in
pkgs.writeText "fcron.conf" ''
fcrontabs = /var/spool/fcron
pidfile = /run/fcron.pid
fifofile = /run/fcron.fifo
fcronallow = /etc/fcron.allow
fcrondeny = /etc/fcron.deny
shell = /bin/sh
sendmail = ${sendmailPath}
editor = ${pkgs.vim}/bin/vim
'';
target = "fcron.conf";
gid = config.ids.gids.fcron;
mode = "0644";
}
]);
environment.systemPackages = [ pkgs.fcron ];
users.users.fcron = {
uid = config.ids.uids.fcron;
home = "/var/spool/fcron";
group = "fcron";
};
users.groups.fcron.gid = config.ids.gids.fcron;
security.wrappers = {
fcrontab = {
source = "${pkgs.fcron}/bin/fcrontab";
owner = "fcron";
group = "fcron";
setgid = true;
setuid = true;
};
fcrondyn = {
source = "${pkgs.fcron}/bin/fcrondyn";
owner = "fcron";
group = "fcron";
setgid = true;
setuid = false;
};
fcronsighup = {
source = "${pkgs.fcron}/bin/fcronsighup";
owner = "root";
group = "fcron";
setuid = true;
};
};
systemd.services.fcron = {
description = "fcron daemon";
wantedBy = [ "multi-user.target" ];
path = [ pkgs.fcron ];
preStart = ''
install \
--mode 0770 \
--owner fcron \
--group fcron \
--directory /var/spool/fcron
# load system crontab file
/run/wrappers/bin/fcrontab -u systab - < ${pkgs.writeText "systab" cfg.systab}
'';
serviceConfig = {
Type = "forking";
ExecStart = "${pkgs.fcron}/sbin/fcron -m ${toString cfg.maxSerialJobs} ${queuelen}";
};
};
};
}
|